US 11,692,889 B2
Control methods for a force sensor system
Pablo Peso Parada, Edinburgh (GB); and Hamid Sepehr, Edinburgh (GB)
Assigned to Cirrus Logic, Inc., Austin, TX (US)
Filed by Cirrus Logic International Semiconductor Ltd., Edinburgh (GB)
Filed on May 3, 2022, as Appl. No. 17/735,582.
Application 17/735,582 is a continuation of application No. 16/850,117, filed on Apr. 16, 2020, granted, now 11,408,787.
Claims priority of provisional application 62/915,245, filed on Oct. 15, 2019.
Prior Publication US 2022/0260439 A1, Aug. 18, 2022
Int. Cl. G01L 5/00 (2006.01); G01L 25/00 (2006.01); G06F 3/03 (2006.01); G01L 1/22 (2006.01); G01K 3/00 (2006.01)
CPC G01L 5/0038 (2013.01) [G01K 3/005 (2013.01); G01L 1/22 (2013.01); G01L 25/00 (2013.01); G06F 3/03 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A method of controlling a force sensor system to define at least one button implemented by at least one force sensor, the method comprising:
receiving a force sensor input;
determining a gradient of the force sensor input; and
controlling the force sensor system based on the determined gradient;
wherein the method comprises:
comparing the determined gradient to a first re-calibration threshold and a second re-calibration threshold, wherein the first re-calibration threshold has a negative value and the second re-calibration threshold is set at a level higher than, or more positive than, that of the first re-calibration threshold; and
triggering a re-calibration of the force sensor system if the determined gradient crosses the first re-calibration threshold and the second re-calibration threshold, in that order.